Duplex steam-engine.



E. W. GONKELL.

DUPLEX STEAM ENGINE.

APPLICATION FILED MAY 6, 1908.

929,658. Patented Aug. 3, 1909.

3 SHEETS-SHEET 1.

E WMMIIIWWIMM 1&

E V I gnvznl'oc Witness E. W. CONKELL.

DUPLEX STEAM ENGINE.

APPLICATION FILED MAY 6. 1908.

929,658. Patented Aug. 3, 1909.

3 SHEETSSHEET 2.

Elwuzutoz j 1-, 1, I attenuate E. W. CONKBLL. DUPLEX STEAM ENGINE. APPLICATION FILED MAYB, 190a.

Patented Aug. 3, 1909 3 SHEETS-SHEET 3.

gluuenfoz o- AQ M (lttouuqo "15 valve chest commonly in use in duplex en- 25 quickly and conveniently inade.

marten cran s BN1. enrich.

ELIAS w. CONKELL, or cAN'roN, OHIO, ltssiouon or ONE-FOURTH TO WILLIAM A. uannnmiv AND ONE-FQURTH TO JACOB J. Hunt, or CANTON, OHIO.

nurmix sjrnan-nneinn.

No. 929,658. Specification of Letters Patent. Patented Aug. 3,1909.

Application inert a-tat e, was. Serial No. 421,095.

To all whom it may concern: I Y 9 .is a perspective view of the valve showing Be it known that I,-EL1As W. Commml, a the inside of the same. Fig. 10 isa -:tp citizen of the United States, residing at Canview of the port-plate, showing the various ton, in the county of Stark and State of: orts and steam ducts in" the same, those Ohio, have invented'a new and useful Dutucts on the reverse or lower side of said .3

'plex Steam-Engine, of which the following late being shown in dotted lines. Fig. 11 is a specification. '18 a sectional view on the line 11-41, of

Fig. 10. Fig. 12 is a sectional view on the i My invention relates to improvements in duplex steam engines for use in connection 0 with pumps or other apparatus of similar character, and especially to a simplified form of such steamv engines as hereinafter set forth; and the objects of my improvement are, first, to dispense with thestearn and line 12-12, of Fig. 10. Pig. 13 is a sectional view on the line iii-13, of Fig. 10. Fig. 14, ,5. is a sectional vicw'upon a vertical plane cutting the two cylinders, port-plate and'baseplate, as indicated by the section line I L-14, in Fig. .2.

Similar numerals refer to similar parts "9' throughout the several views.

In the construction illustrated the two cylinders 1 and are arranged side by side, the axis oi one being parallel with the axis of the other, the two being preferably cast in one piece and the walls of: the two cylinders .gines; second, to provide a duplex engine [with few moving parts; third, to cheapcn the construction by providing a device avherein the various parts are easily made.

and such castings as are necessary, of simple form; fourth, to provide aduplex steam engine which-niayeasily he kept in repair, united at 3 in a partition common to both and in which, because of its simplicity of cylinders. At the front end the cylinders I construction, any necessary' repairs may be are closed in the manner well known in the I art, and stuiling boxes 4 provided. The cyl so inders are bored in the usual manner and the head 5 is so arranged at the rear end of the cylinders as to close both of them. -In Figure 1 is a side view of my nn r'oved cylinder 1 the ports 3, 7, S and 9 are proengine in connection with a pump 0 ordivided and also the exhaust port 10. In cylnary construction, the said view showing the i inder 2 the ports ll, 12, 13 and ll, are proengine in longitudinal section in a plane invided and also the exhaust port 15. These dicated by the section line 1 .-l of Fig. ll. ports are arranged at shown in. the drawings, Fig. 2 is a sectional view. upon a horizontal the ports (3 and ll being at the rear ends of plane cutting the two cylinders on the line the cylinders, the ports 9 and 14 being at the 2-2, of Fig. lat, and showing the relation front. ends, the exhaust ports'lO and 15 lo of the various. ducts and ports by dotted cated at points equidistant from the ends of lincsp Fig. 3 is a sectional view similar to the cylinders and the ports 7 and S and 12 Fig. 2, except that in Fig. 3 the pistons and and 13 being located on either side of and 40'valves have been removed from the cylinders. adjacent to the exhaust ports 10 and 15 'Fig. l is a perspective view from above, respectively.

. showing the ct, 'linders, port-plate and base- Within each cylinder a double-headed pisplate separatet from each other, with dotted ton is provided, the piston in cylinder 1 havlines indicating their appropriate relation ing the rear head 16 and the front headlt 45 when assembled and a portion of one of the and the piston in cylinder 2 having the rear cylinders broken away to show the arran'gehead 18and the front head 19. In Fig. 2 'a ment of the ports therein. Fig. 5 is a pertop view of the piston in cylinder 1 is shown, spective viewof the same parts frombelow, while the iston in cylinder 2 is shown in the parts beingseparated as before and dotlongitudina cross-section. In construction i l l l l l I attain these objects by the mechanism llustrated 1n the accompanying drawing, in which so tedlines showing their proper relation. Fig. the pistons in the two heads are alike and .1-05

(3 is a perspective'view of one of the double for a detailed description of such pistons headed pistons. Fig. ,7 is a perspective view reference is made to Fig. 6 which will illusof one of the valves on the same scaleas tratethe piston in cylinder Qt. In Fig. (l Fig. 6 F g. 1s a perspective view (if-the the heads 16 and 17 are provided with piston 55 valve showing its external construction. Fig: rings of the usual construction. The piston 1Y9 rod 20 with the shoulder 21 better shown in Fig, 1 is provided, and: the reduced portion pl said rod passes throngh', the heads 17 and 16, and is secured by the nut 22. Extending between the heads l6 and 1.7 at the top of the piston as it noiinelly operates in the cylindex the piston guide 23, which is pro- 1xvided with the longitudinal slot 24. tending between the heads 17 and 16 of the go said piston at the bottom oi the same as it ;;;noi mn lly operates in the cylinder are the Yvelve guides 25, and which are adapted to hold '11,. valve 27-, shown detached in Fig. 7 to its'plnce in, the cylinder on the bottom 4 15 side thereof 18 better shown in liig ld. 0n

the inner sides of the'li'eads l7 and 16 and between the valve guides 25 and 2?; are arranged the lugs 28.121161 as better-shown in Fig. 1, which logs are adapted to engage 20 the valve 2? and move it so as to alternately open and close the ports as hereinafter more v fully set out.

In assembling the engine the valve 27 is placed between the valve guides and 2G 25- and the piston introduced into the cylinder.

The. piston guide 23 is brought to the top of thecylinder and e guide pin introduced thronghe screw threaded epertureet the top ofthe cylinder Wall the lower end. of said 1,30 guide pin being thus brought into, engageinent with the sides of the slot 24 in the piston. guide 23.. It will be apparent that with this arrangement of ports the piston will be free to move longitudinally Within the cyl- '35 inder, hntthat any rotary movementwill be prevented. I

The -distance between the heads of the piston, withv relation to the length of the cylinder, the length of the valve and arrangeinen't of the ports in said cylinder, is such that when the piston moves to its extreme front position the lug 29 on the head 16 will move the valve 27 into position to register with the ports 8 Ind 16, leaving the port 7 in connnunication with the poition of the cylinder between the hoods 1G and 17. When the piston moves to its extreme rear position the lug 28 will engage the valve and move it into position to register with the ports 7 and 10 and when the valve is in this position the port 8 will communicate with the portion of the cylinder between the heads 16 end 17.

At 2L point m ni-distant from the front and roar heads ef the. cylinders and new: the

(10 tween the two threaded to receive the steam pipe, and from the said aperture the inlet enters cylinder 1, and the inlet 34: enters cylinder 2. It will he understood that altliough the doubleheaded pistons move backward and forward within the cylinders, the said heads at no time pass the steam inlets and 34, and (l nt any sleam entering through the steam pipe 31 will be conducted to that portion of the cylinders between the heads of the pistons, In this way it may be said that the portions of the cylinders between the fiends of thepistons, no inatterat What part 0, the

stroke the said pistons may be,-- are to be regarded the steamchest of the engine. Attention, should also be called to the. construction of the valve 2'7 shown enlarged in Figs. 8. and 9. variety having the parallel sides and 36 and the parallel ends 37 and 38 and the lower edges of the said sides and ends being ground in such Wily as, to closely fit the inside surface of-the cylinder. The interior of the valve is substantiallysemi-cylindrical, the said interior or chamber being designated 89. The lower ed 'zes of the valve guides 25 and 26 are so shaped its to con-' This valve is of the D form to the miter surface-0t the valve 27 along the sides and 36 as bestshown in Fig. 1e. 4

Attention is now. directed to the method of constructing the etesmildncts and passage- Ways-in the port-plnte whereby the proper inter communication between the various.

ports in the cylinders-is provided, On the exterior of the bottom of the cylinders the wells of said cylindersjilre continued-into a I 1 plain, flat, lower surfec'eshown at; 4on1- opcnings in the surface lfl-shown in 5, said openings hemp; nmnherfllwitli refer ence to the ports ofwhieh they are the conl'ii'mal'ion. The fJort-plate ll is provided with the ducts 42 andi lil in ilis'npper sur.

face and the ducts/Mend 4:? in its lowel sin-face. The passage way is adapted to communicate with the port 6 and leads throngh the port-plate to the duct 4%. At the other end of the said ddct is the postage- "The ports, as previously deseribedthe lwo cylinders, are contmued,.prodn e111g the v way 47, which is in communication Wllll the said duct 4-4, leads through the port-plate 41 and registers with the port 13. The duct 4-2 cmi'mninicates with the port 11, and it its other-end with thep ort .7. The duct '43 communicates" with the port?) and at its other end with the port 12. The passage- Way 4:8 registers with the port 14, leads through the port-platefand communicates with the duet 45. At the-other end of the duct 45 is the passage-Way 49, which leads through the port-plate and registers with the port 8, The passage-way 5O registers with'the exhaust port 15 and leads directly through the port pla-te. The passage-way seems 43 y 5.1 registers with the exhaust port and also leads directlythrough the port-plate. The base-plate is provided with the upper plain surface 53adaptcd to engage the lower 5 plain surface at the port-plate. Upon the lower side of tllc said base-plate the exhaust v outlet s prwrided, to which outlet a suitable more pipe may be attached. The integral extensions 55-5ll of the hose-plate 1Q" form suitablefeet or losses upon which the engine may rest. Through the baseplate 52 the exhaust opening 56, registering with the passage-Way 50, leads to the ex illi lliSt outlet. The exhaust opening- 57 regisin .tering witlrthe exhaust passage-way .51, leads a o theexhaust outlet in asimilar manner.

F or the purposeot' limiting the longitudithcir being so displaced as not toregister at all times with the exhaust ports 10 and 15. the valve stopsl) are provided. These valie stopsconsist of wedge-shaped ieces :of metal driven upward within the cx liaust Qp'tuts iii-om the lower side of thecylihdcrs, 'as shown in Fig. 5. It will be seen that the exhaust ports are of certain'dimension trans-- worse to the cylinders, and that'ithe said stops are of less dimension transverse to'the cylindcrs than the dimension of the said ports. St) .The said stop=,l1ow ever,heing wedgoshaped, are larger at their bases than at their tops and said bases are slightly'wider than the exhaust ports 10 and 15 as shown in Fig.

It ,practipally necessary aportion of the '5 theta attire sides of said exhaust ports on the suriacefltl may be cut away to allow for the extrawidtli of the said stops. The exhaust. passage-ways and 51 are of the same width theexhaust ports 15 and 10 1 respectively. and it will he understood that after the said stops have been driven to place and the cylinders and port-plate attached together the edges of said exhaust openings in the port-plate will hold the 45 valve stops to their places in the said exhaust ports. As best illustrated in Fig. H ill upper ends of the valve stops extend above the inner surfaces of the cylinders and into the chamhcr or interior of the valvc. 5Q-.-,In this manner it will be seen that in their longitudinal movements the valves cannot pass tho-valve stops and will be kept in reg:

ister with the exhaust ports at all times. kloles are provided at suitable places in 55 the base-plaleffl, and holes in the port-plate 7 4'1. and in the tint lower portion of the cylinders are prot'idcd, registering with the holes in the; ase-plate The holes in the cylinders re screw threaded-and bolts 58 c0 provided for the purpose of connecting and clamping the said cylinders,- port-plate and 1 base-plate togetli'erin the relation indicated big the dotted lines in Figs'.4"and 5. lt will li e understood-that the'sur't'acelfl on .the-

'. lower-s ideb f' tli'e cylintlers, the surfaces of nalmovement ofthevalves 27 and preventing theport-plate 41, and the surface fi of the base-plate are accurately machined in such way that practically very little packing will herequired to prevent an} leakage of steam from one port or duct to another, this arrangement being well known to practical mecl-ianics. 1

The various parts having; been assembled and..,stcanr under pressure being admitted throiigh the stealn'pipe 31, the operation of the various parts is here dcscrihed. Let it be assumed that the pistons and valves are .in the position shown in Fig. 2 at the time of starting. W'hen the steam admitted a. quantity of said steam under pressure will fill the space between the heads of the pistons in each cylinder. In cylinder 1 port 8 is open and steam will pass through said port,-passage-way 4-9, duct passage-way 4S and enter cylinder 2 through port 14. and cause the piston in said cylinder to move to its "l)ackward position. The exhaust from thc gcear end of cylinder 2 will pass through point 11, duct 42, port 7, the interior of thc I valve in cylinder 1, exhaust. port 10, passageway 51, exhaust opening 57 and out through the exhaust outlet 54. \Vhil thc piston in cylinder 9. is thus mov ng backward, steam will be forced through port 1) in cylinder 2, duct 4&3 and port 9 in cylindcr,1 thus holding'the piston in cylinder 1 in position at the rear end of said cylinder.

lVhen theYpiston in'cyl nder 2 nears the end of its backward stroke the lugon the head 19 will move the valve backward to icgistcr with the ports 12- aud 15, opening the po'rt 13. The piston in cylinder 2,.coming; to rest at that point, will be held in such position so long as steam is supplied to cyl-r unlcr i2 throiygl'z h port 14. The position of the valve in the cylinder 2 having been thus changed, steam will enter thc open port 13,-

passapc-way l7, duct tal, passiigeuvay 4G,

and cuter cylinder 1 through port (i. This will move the piston in cylinder 1 to its forward position and thc cxhaustin front of.

tor with the ports 8 and 1-0 and at the same 1 time open port 7. Steam t-rontinuing to cuter cylinder 1 through port 6' will hold the piss ton in temporary rest at its :t'orward, pos tion. 3 team now will pass through port 7, duct 4-2, and will enter cylinder 2 throusrh port 11. This will cause-the piston in cylinder 2 to more to its-forward po-ition, the: cxhaust from the front end of cylinder 2- passing through port 14, passage-way 48f duct 41:"), passage-way 49, port 8, the interior of the valve in cylinder'l, exhaust port 10.

passageway 51,exhaust ters opening 57 and out through the exhaust outlethet. As the piston in cylinder 2nears the end. of its forward'stroke the lug on the head 18 will engage the valve in cylinder 2 and move it to register with ports 13 and 15, and will open port 12. This will return ell of the partsto the position before noted when the steam was first admitted through the pipe 31, and the engine will continue to operate through cycles'the same as that just described, each piston moving forward and backward alt-ernately and coming to a temporary rest at each end of the cylinder while the piston in the other cylinder is moving;

Having fully described my invention what I claim as new and desire to secure by Let atent, is-.- 1. 'lheherein described.- duplex steamengine comprisingcylinders arranged side by side, the said cylinders provided with ports near their front, and rear ends and exhaust sliding movement of the said valve Wit-h ports arranged intermediate the said ends, ports arranged on both sides of said vexhaust ports and adjacent therettn-all of said ports and exhaust perts being on the' bot-tom' side of said cylinders and arranged in lines parallel with the; ages of said cylinders, a double-headed pistonarrang ed ineachcylindenza'valve ineach cylinder adapted to registroviththeexhaust port and either one or the other ofthe ports adjacent thereto by longitudinal slitlingj'movernent; the longitudinal dimension of said valve being less than the distance bBtEVUCl-l"tll8vSPflC6(l heads iol the piston, the said valve unatr,

tache'd to the piston heads and; adapted for longitudinal adjustment with reference to said headsythe said valvefadapted to be moved in said longi'tudinai adjustment alternate! y ia'n's of one or the other of the spacer heads: of the piston and adapted to remain at rest. during a part of thestroke of the piston, n'ieans of intcr-comnnin cation between the said ports and exhaust, ports and means for admitting steam under pressure to that: portion oi the cylinders between the heads of the pistons.

2. in an engine oi. the class described, cylinder provided with ports, a piston having two heads; spaced from each other, said piston arranged within said cylir'ider, a pis ton guide provided with a longitudinal slot extending between said heads, valve guides extending;- between said heads and adapted to hold a valve in place against the side of? the cylinder, a guide pin-ai ranged inzthe' Wall or said cylinder" and in engagement with the walls of said longitudinal slotin the piston: ,g'uide,flan exhaust port and a port longitudinally shared on either side of the exhaust port, the said piston heads with relation to said valve being adapted to alternately engage and disengage said valve and'to'rnovc it longitudinally to'register access of register during portions ofthe strokes-of said piston, and means for supplying steam to that portion of the cylinder between the spaced heads of the piston.

scribed, cylinders arranged side by side and having their walls united in a partition cornmen to both cylinders, the said cylinders provided with ports near their front and rear ends and exhaust ports arranged intermediate said ends, ports arranged on either side of said exhaust ports in longitudinal line with said exhaust portsand the ports at the front and rear ends, a piston provided with spaced heads arr-an ed in each cylin-- der, valve guides exten ing between. the spaced heads of'each piston and adapted to hold a valve in place against the side of the cylinder'while pernlitting a longitudinal reference to the. spaced heads of the piston,

with the said valve guides, said valve adapted to register with the exhaust port'and either one, orthe other otthe ports adjacent thereto by the said longitudinal sliding inovement, the longitudinal dimensions of lsaid valve less than the distance between the communication between said ports and-exhaust ports and means tor admitting stearn' cylinders between the heads of the pistons.

cylinders placed side by side and having ders being extended into a portion having a lower external plain surface, ports are ranged in said cylinders near their front and rear ends, and exhaust ports arranged either side of said exhaust ports and adjacent; thereto, all of said ports and exhaust ports being arranged on the lower side of said cylinders and in line with'the axes thereof and extending directly through the said lower external plain surface, valves ar-f ranged within said cylinders and adapted" to provide inter-conimunic'ation between the various ports-and. exhaust ports Within said communication between the said ports of the cylinders extended through the said lower plain surface, the said means comprising a and lower parallel plain surfaces, the upper plain sunfaceof said port-plate adapted to engage th'clower plain surface {iii-e cylirn dc'rs, passage-ways leading t n'ough said into said port-plate from the plain surfaces- "with the exhaust port and one or other of said ports respectively, said valv'e adapted I to remain at rest in either of said positions .7

3. In an engine of the class herein 'de-' a D valve in each cylinder -in engagement.

under pressure within that portion of the intermediate said ends, ports arranged on cylinders and means-of extra-cylinder interspaced heads of the piston, means of inter-:

4. ln a steam engine of the class described,

their walls united in a partition common to both cylinders, th -v walls of said cyhnseparate removable port-plate having upper port-plate from surface to surt'are, ducts letthereof, certain of said ducts providing,

inter comnninical'ion between.eeriniirof the passage-Ways}, in snid port-oldie; {ind-{certain of said ones eo nmunicating with but one of szi-ieljiiassagonvnys,end separate, reinovable hase-plat provided "with an upper plain surface adapted 'to sugars. e loWr-r surfaeemf tho port-plate, n exhaust outlet and exhaust open from said exhaust outlet through the l surface, certain ports in the cylinders adapt ed to register with certain passage-ways and ducts in the port-plate nnd'l'he exhaust pussage-wuys in the. base-plate adapted in req; ister with certain of the imssnge-wu in l 1o port-plate and means for doin'ehahly fastening said rfslinders, port-pinto and ltmso-plnte tog ether in their approprinle operative relution. 5. In an ermine of the class herein scribed, the combinniion of Qvli' izrranged side by side and lru 'in'g heir walls united in :1 partition common To both of. linders, ihe said cylinders provided with, Doris near their front and rear ends, and exhau t ports arranged intermediate the hencin of said cylinders poris arranged on either side of snid exhaust porisand iadjneent therein. all of said p rts and exhaust ports luring arranged on ilie lower side of said Cylinders and in line with the axes ihereof, r. pinion provided with spa ced hoods arranged in each cylinder, a piston guide pro with l} longitudinal slot extendir the heads nf'ench pinion ill the lop side 0%? the some, a guide pin arranged in eneh cylinder and in. engagement. wiih the sides of vile slot of said piston guidm valve guides extend belween llie heads of each piston or the hotlmn of the some and ndnpled to .uold :1 valve in plane against ho hoitam side of "rhe cylinder while gwruiitling :1 longitudinal slidine: inovenwni with reference thereto, 21 D valve in earl! cylinder upon the lvoi' 'tozn side thereof and in enmzgemeni, with tho said valve guide 5f d. valve notified lo regis'l-sr I on the inner si,

with the exhaust port and either one or the other of the ports ndinreni thereto lov longiiudinnl sli ing zidji nienln, the longitudinal dimensie rid vii. v0 l'hnn the disinnre between the sword hends'rd' (he piston, logs s of piston i'zeiids 30elweon the valve gnicles :nid Lldliplfll for engagement with Li viiive in}: the PlII'PQSfi of coring (he valve loingitndinz rrimin said inder, means of iutsr-mnnmunirnlion lirmm the said oorrs rind exhaust ports and means forndmitting ream under pressure beiween that portion of iliion'viinder hero-min lhe beads of the'pistoniinhalant-loll; nod

for tho-purpose specified (S. Tn on engine or he class herein wesr'riloed. il'ie'comhiunlion of cylinders arranged side hv side rind-having lhoir walls i v unified in n giartitiou common to both eylin n air their "front and renr'ends', and exhaust ports arranged intermediate the heiulsof suideviinders, ports arranged on either side oi? said exhaust ports and adjacent thereto, all of said ports and exhaust porlsbeing arranged on the lmver side of said cylinders,"- und in line with the axes thereof, a piston provided with spaced heads arranged in each cylinder, :1 piston guide provided with a longitudinal slot extruding between the heads of enrh piston iii the top side of the some, a guide pin arranged in each cylinder and in engagement with the sides of the slot of said piston guide, valve guides extending between the hemlsof each piston at the hotiom of the some and adopted to hold a valve in place against the bottom side of the cyl-v inder while permitting nzlongitudinal slidins movement with reference thereto, a D il-ve in each Qlll'HlQ! upon the bottom side mereo'f and in engugenient with the said vfiive guides said valve adapted to register v ll. the exhaust port and either one or the minor oi the ports adjacent thereto by longiuiii'nnl sliding adjustment, the longitudinal nn; .ion of said valve less than the distance WALFQGT: (he spaced heads of lho'piston; lugs on (he inner sides of the piston heads bewen the vnlv'e'guides and adapted for en- .menl with line. valve for the purpose of in; the valve longitudinally within'snid l 3, n valve slop arranged Within the usi. portnnd. extending above the inner :r'i'zw: 5i lire cylinder and into the chamber valve and adapted to limit the longiiudinnl movement. she of, means of interron'ununirn ion helween the said ports, and enlinusi po' and means for admitting damn und he cylinder bt ween the heads of the pistons, nnbsianiinlly and for the purpose specified.' Y; In an angina oi the class described; the

.T:on1l ina'ion of n o linder provided with oris, a, piston having r-vvo heads jspaed 1 from each other, and connected only by the nision rod, piston guide and circumfereniinlly spaced valve guides. said piston guide and vnlve HliillQfiiiill'l'flDfZfll closely adjacent in the inner snrfmres of the cylinders, an ex-, b11 28! oorl and :2 nor; longitudinally spaced n side of the exhaust port, a valve on or V hold .iz wince between said valve guides and cvliinler and into the chamber m": the valve; and ndnpied lo limit lhe longitudinal move- "ment 0% lhn same.

- E The wind; inn with ihe cylinders {)lffzffi: ide hv sud"- znid pri'n'ided with steam L0 giressnre into that portion of 10.5]

and extended oliove the inner surjluee of lhel base-plate provided with an upper united in a partition eonnnon to both inlets, ports and exhaust ports and interconnnunicating passage-ways and ducts, oi"

the pistons with spaced heads, arranged in said cylinders, ui'iattached valves prov ded with chambers, said valves being arranged between the said spaced heads and adapted therewith, means 9. In a steam engine of the class described, the coinbinatlon of cylinders placed side by side, ports in said cylinders, the wall of said cylinders extended into a lower external plain surface and means of inter-connnunication between the said ports, the said means comprising and ponsisting of a separate, removable port-plate having" upper and lower surfaces and passage ways leading through said port-plate and a separate, removable plain surface adapted to engage the lower surface of the port-plate and having an exhaust outlet and exhaust. openings leading from said exhaust outlet; through the plain surface, certain ports in the cylinders adapted to register with certain passage-ways and ducts in the port-plate and the exhaust passage ways in the base-plate adapted to register with certain of the passage-ways in the portplate and means for fastening said cylinders, port-plate and base-plate together in their appropriate operative relati n, substantially as aitdjhr the purpose specified.

it). 1:: an engine of the class herein described, the combination ot cylinders arranged side'hy side and having their walls 3' inders, the walls of said cylinderstxtended into a lower external plain surface, ports arranged in said cylinders near their front and rear ends, and exhaust ports arranged intermediate the ends of said cylinders, ports arranged on either side of said exhaust ports and. adjacent thereto, all of said ports and exhaust ports being arranged on the lower side 01, said cylinders and in line withthe axes thereof and extending through the lower external plain surface, a piston provided with spaced heads arranged in each cylinder, a piston guide provided with a longitudinal slot. extending between the guiding said valvesyin their longitudinal eaaeee heads of each piston at the top side of the same, a guide pin arranged-in each cyllnder and. in engagement with the sides of the slot of said piston guide, valve guides extending between the heads of each piston at the b0t-;-6Q

tom of the same and adaptedto hold a valve in place against the bottom side of the eyl inder while permitting a longitudinal slidni 2'3" lnoifiliiellii of such valve with reference thereto, a ll) valve in eacli cylinder upon by longitudinal slidin adjustment, the ion-" gitudinal dimension 0 said valve being less, than the distance between the s ace'd heads of the piston, lugs on the inner? des of the piston heads between the-valve guides and adapted for the purpose of moving the valve longitudinally within said cylinder, a valve stop arranged within the exhaust port and extending above the inner surface of the cylinder and into the chamber of the valve and adapt- 8:7

ed to ll1llli ill0 longitudinal n'mveinent thereof, and means of iliter-coinmunication between the said ports in the cylinders, the said means comprising a separate, ren'iovahle port-plate having upper and lower surfaces and passage-ways leading through said portplate and a separate, removable base plate provided with an upper plain surface adaptcd to engage the lower surface of the port-- plate, and having an cxha haust openings leading from said exhaust outlet. through the plain surface, certain ports in the cylinders adapted to register with certain passage-ways andducts in the port-plate and the exhaust the base-plate adapted to register with certain of the passageways in the porteplate and means for fastening said cylinder, portplate and baseplate together in their appropriate operative relation, and means for ad- 10-0 mitting steam under pressurev into that portion of the cylinders between the heads of the pistons. y

In testimony that I claim the above, I

have hereunto subscribed lliy llttllltb in the 105 presence of two witnesses.

ELIAS W. (-ON'KELL. vl/"itnesses \VILLIMI H. MILLER. SrLviA Bones.

engagement. with the valve for 7a ust outlet and ex- 9( nissage-ways in 

